Influence of the Three Gorges Dam on Sediment Budget at Mouth Bar of the Yangtze Estuary

摘要

The influence of the TGD (Three Gorges Dam) constructed upstream onrnthe sediment transport in the Yangtze Estuary has been investigated inrnthis paper. The process-based model is used to simulate the sedimentrntransport in the Yangtze Estuary before and after the TGD constructed.rnThe result shows that the influence of TGD on the sediment budget inrnthe mouth bar area of the estuary is significant. The seasonal feature ofrnsediment transport around the mouth bar area remains the same after thernTGD constructed as that before, i.e. erosion in dry season andrndeposition in wet season with sedimentation in total over a year.rnHowever, the magnitude of total amount sediment trapped in the mouthrnbar area decrease tremendously after the TGD constructed, as accountrnof 25% of that before.